Display Device With Matching Refractive Index Filling Member
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Solution Overview
Problem
Display devices using polymer dispersed liquid crystal (PDLC) in edge-light mode experience decreased luminance as the distance from the light source increases, and the junction between adjacent OLED display panels exhibits light refraction and reflection issues, leading to visible boundaries and color shifts when viewed from oblique directions.
Innovation Solution
A display device configuration featuring a first and second display panel with liquid crystal layers, a filling member with a refractive index matching the substrates, and a light guide to enhance luminance uniformity and reduce light reflection, using an adhesive member to bond the panels and guide light effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If edge-light mode is used for PDLC displays, then the device structure is simplified, but luminance decreases as the location is farther away from the light source
Solution Approach 1:
The patent divides the light guide into multiple segments with different optical properties. Specifically, it uses a first light guide with a first refractive index and a second light guide with a second refractive index higher than the first, allowing each segment to contribute differently to light distribution and achieve more uniform luminance across the display surface.
Solution Approach 2:
The patent applies different refractive indices to different regions of the light guide system. The first light guide has a lower refractive index suitable for initial light distribution, while the second light guide has a higher refractive index to enhance light extraction in specific areas, creating locally optimized light distribution characteristics.
2Area of stationary object
If multiple OLED display panels are bonded together, then large-scale display is achieved, but light refraction and reflection occur at the junction between panels
Solution Approach 1:
The patent changes the refractive index parameter of the adhesive material used to bond display panels together. By selecting an adhesive with a refractive index that matches or closely approximates the glass substrates of the OLED panels, optical discontinuities at the junctions are minimized, reducing light refraction and reflection effects.
Solution Approach 2:
The patent introduces an adhesive layer as an intermediary substance between adjacent display panels. This adhesive serves as an optical mediator that bridges the optical properties of the glass substrates, enabling smooth light transmission across panel boundaries while maintaining mechanical bonding.
3Area of stationary object
If display panels are arranged in a tile-like pattern, then large display area is achieved, but visible boundaries appear due to light reflection and refraction
Solution Approach 1:
The patent adjusts the refractive index parameter of the adhesive material to match the optical properties of the display panel substrates. This parameter matching minimizes optical discontinuities at the boundaries between tiled panels, making the boundaries invisible or significantly less noticeable when viewed from various angles.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The configuration improves luminance uniformity and reduces visible boundaries between panels, maintaining display quality and color accuracy across different viewing angles by utilizing a filling member with matching refractive index and an adhesive member to manage light effectively.
Implementation Method 1
a filling member provided between the first display panel and the second display panel and having a refractive index equal to that of the first transparent substrate, the second transparent substrate, the third transparent substrate and the fourth transparent substrate
Implementation Method 2
a first light guide bonded to the first display panel and the second display panel and opposing an emission surface of the first light emitting element
Implementation Method 3
a first adhesive member provided between the first display panel and the first light guide and between the second display panel and the first light guide
Data Source
AI summary
According to one embodiment, a display device includes a first display panel including a first and second transparent substrate, a first liquid crystal layer, and a first light-emitting element, a second display panel including a third and fourth transparent substrate, a second liquid crystal layer and a second light emitting element, a filling member provided between the first and second display panel and having a refractive index equal to that of the first to fourth transparent substrates, a first light guide bonded to the first and second display panel, and a first adhesive member provided between the first display panel and the first light guide and between the second display panel and the first light guide.